I have been using CFX for the last one year and so far I have always used block-structured hexagonal meshes, generated in ICEM CFD, for my CFX simulations.
Now I want to use Workbench to parametrise my geometry and explore the effects of geometrical changes on CFD results. I am not very familiar with Workbench.
Is doing a block structured hexagonal meshing possible inside Workbench. I have Ansys versions 12.1 and 13.0 on my system. I could not find any tutorials related to this for both versions. I found a tutorial named "Workbench Integration" for ICEM CFD 11.0 but I could not do that tutorial in versions 12.1 or 13.0 as the tutorial mentions a totally different GUI.

If there is no way to perform block structured hexagonal meshing in Workbench, then I will have to use the automated Tetra meshing available in Workbench 12.1 or 13.0. I have never used automated tetra mesh before and I am not sure about using it as I have heard that structured hexagonal mesh is always more accurate for fluid flow.

In summary, my questions are:
a) If it is possible, then how to do and automate a block structured hexagonal meshing (similar to ICEM CFD) inside Workbench? Is there any tutorial for this?

b) How accurate it is in general to use automated tetra meshing for fluid flow instead of block structured tetra meshing?

You can do hex meshes in WB, the mapped mesh feature and sweep meshes are useful for this. But they are no where near as powerful and ICEM hexa and frustrating to use in my opinion. But if you want to parameterise your geometry it is easiest way.